Vacuum cleaner



FIG. 1 is a perspective view of a vacuum cleaner showing my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a reduced back view thereof; and,

FIG. 7 is a reduced front view thereof. 

I claim the ornamental design for a vacuum cleaner, as shown and described. 